[MacPorts] #58836: opencv 3.4.7+contrib: Failed to fetch opencv

[MacPorts]

#58836: opencv 3.4.7+contrib: Failed to fetch opencv
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  Reporter:  barrettsa  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.4
Resolution:             |   Keywords:
      Port:  opencv     |
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Comment (by barrettsa):

 While my Portfile-fu is admittedly weak, I've been able to upgrade (and
 install) opencv+contrib using the Portfiles changes in the attached
 opencv_portfile.diff file.

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Ticket URL: <https://trac.macports.org/ticket/58836#comment:3>
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